Electric brake



July 21, 1925'. V 1,546,864

T. B. PATCH ELECTRIC BRAKE Filed June 8, 1922 UNITED STATES tasselPATENT OFFICE.

THEODORE B. PALTGH, OF BROOKLINE, MASSACHUSETTS.

mnc'rnrc BRAKE.

Application filed June 8,

To all whom it may concern! Be it known that I, THEODORE B. PATCH, acitizen of the United States, and a resident of Brookline, county ofNorfolk, and Commonwealth of Massachusetts, have invented an Improvementin Electric Brakes, of which the following description, in connectionwith the accompanying drawings, is a specification, like characters onthe drawings representing like parts.

This invention relates to brakes for vehicles and particularly toelectrically operated brakes, and aims to provide an improved form ofconstruction therefor, and

. one particularly adapted for use on the front wheels.

In the drawings of one embodiment of my invention selected forillustration and description herein,

Fig. 1 is a side view of a conventional wheel with a brake drum thereon;

Fig. 2, a vertical section through the drum in the line 22, Fig. 3,showing a side view of the brake shoes and cooperating parts; and

Fig. 2, showing the method of mounting the brake shoe and anchors.

Referring first to Fig. 3, my improved construction is shown ascomprising a head or support 1 of brass, or any suitable nonmagneticmaterial, mounted upon the steering knuckle 2, of a front wheel, andthus of course adapted to turn therewith. This head is provided, Figs.2, 3, on its inner face on the curved supporting rod 13 mounted in posts14. on the support is a movable stop in the form of an electro-magnet15, hanging adjacent to but kept normally away from the drum 10 by aweak spring 10*. The wires 16 from the magnet extend through an aperture17 to any source of electric energy, as a battery 21. The ends of thecore of Fig. 3, a vertical section on the line 3-3,

1992. Serial m. 566,851.

the magnet are tipped withsome non-magnetic material 18, as brass, toprevent diversion of the magnetic flux from its proper course andenergizing the shoe. I

The method of operation is as follows: When it is desired to apply thebrake the magnet 15 is energized, through the instrumcntality of anydesired controlling switch or, means, not shown, and it immediatelyattaches or anchors itself to the drum 10 adjacent to which it normallyhangs suspended and becomes a fixed stop for the shoes. The coil spring10 is sufliciently long and flexible to permit the limited travel of themember 15 required in the above described operation without detriment tothe spring. The rotation of the wheel and attached stop 15 causes thelatter to engage one end of one of the shoes 6, 7, according to thedirection in which thevehicle is moving, and it forces the shoesoutwardly against the flange 9 of the drum with suflicient force toapply them firmly thereagainst and stop the car.

Upon the opening of the battery circuit and deenergizing of the magnetit is drawn away from the drum by the spring 10 and it naturally slidesdown its curved support 13 to central and inactive position again.

To prevent the shoes 6, 7, from rotating too far with the drum 10, ifthere should be an inclination to do so, they are each provided with ancar 19 which, after the shoe has travelled a limited distance, engagesan ear or fixed stop 20 in tandem relation to the stop 15 on the head,and thus prevents further movement of the shoes the stop 20 in such caseassisting in stopping the rotation of the drum and movement of the carthrough the action of the shoes thereon.

It will be noted that the brake is a double acting one, that is, it actsin either. direction and utilizes the motion of the wheel as a breakingforce. The brake may be used on either the front or rear wheel, is freeof complicated mechanism, such as universal joints and stop joints, andis simple in construction and sure in operation.

My invention is not limited to the particular embodiment thereof shownand described, and I claim:

1. An electric brake for motor vehicles comprising a drum, a support, amovable magnetic stop member on the support, a brake shoe detached fromthe stop member, and means to cause the movable stop to anchor itselflaterally upon the drum in the path of the shoe and to expand the shoeagainst the dru'm.

2. An electric brake for vehicles comprising a drum, a shoe support, abrake shoe on the support, a, magnetic stop member within the drum, andmeans to anchor the stop member to the drum and cause it to driv theshoe'against the drum.

3. An electric brake for motor vehicles comprising a drum, a support, amovable stop thereon, brake shoes on the support, means for electricallyanchoring the movable stop upon the drum end between the shoes and toexpand the shoes against the drum.

4. An electric brake comprising a drum, a support, brake shoes thereon,a fixed stop on the support, an electro-magnetic stop movable in acurved path on the support, and means to energize the magnet to seat itagainst the drum and cause it to expand the shoes against the drum.

5. An electric brake comprising a drum, a support adjacent the drum end,brake shoes thereon, an electromagnetic stop movably mounted on thesupport, and means for energizing the stop to anchor it to the drum endin the path of the shoes and to throw them against the drum.

6. An electric expansible brake comprising a drum, a support, brakeshoes thereon, an 'electro-magnetic stop movable laterally andcircumferentially on the support, and means to energize the stop toanchor it to the drum end while suspended from the support.

7. An electric brake for vehicles comprising a drum, linked brake shoestherefor, a fixed stop and a movable stop on the support and within thedrum, and means to anchor the movable stop to the drum between the shoesand thereby cause the stop to throw the shoes radially toward the drum.

8. A motor vehicle brake comprising a support, brake shoes thereon, afixed stop with a movable stop slidably supported thereby and betweenthe shoes,'m'eans to ansupport, brake shoes thereon, a stop membersuspended between the opposed ends of the shoes, and means to anchor itagainst the drum end and thereby cause it to'push the shoes against thedrum.

.11. A motor vehicle brake comprising the support 1, brake shoes .6, 7,thereon for circular and outward movement, the drum 10, enclosing thesupport and shoes, stop rod 18 on the support, the movable stop 15 onthe rod 13, and means 16, 21 connected thereto, to anchor the stop 15against the drum end to throw the shoes-against the drum. I

12. A motor vehicle brake comprising a support, a drum, movablyconnected brake shoes within the drum, guides for the shoes andsupporting the same, a fixed brake stop within the drum in the path ofthe shoes, a movable stop on the support, and means to anchor themovable stop to the drum end and thereby to cause it to push one brakeshoe radially and circumferentially against the drum.

13. An electric brake comprising a support, brake shoes, a fixed stoptherefor and a movable stop therefor disposed in tandem relation on thesupport, a drum enclosing the stop and shoes, and means to anchor themovable stop to the drum to cause the stop to engagethe shoes and throwthem radially against the drum.

14. An electric brake comprising a support, a brake shoe thereon, a.fixed stop on the support, a movable stop also thereon and means to movethe movable stop across the path of the shoe to anchor the stop andthereby cause the drum to drive the shoe against the drum flange.

15. An electric brake comprising a drum, a support, brake shoes movablecircumferentially relative to the drum and within the same, a fixed stopfor the shoes adjacent their paths of movement, a movable stop in thepath of movement of the shoes and means to anchor the movable stopbetween the shoes to cause it to throw them radially andcircumferentially against the drum.

.16. An expansible brake comprising a drum, a support, shoe guidingflanges in a curvilinear path thereon, a shoe on the support and betweenthe flanges and drum, a traveling stop member'on the support detachedfrom the shoe'and within the path of the shoe, and means to anchor thestop member laterally on the drum and in the path of the shoe.

In testimony whereof, I have signed my name to this specification.

THEODORE B. PATCH.

